Constant load bolt
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United States of America Patent
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Issued Date -
Mar 27, 2008
app pub date -
Sep 22, 2006
filing date -
Sep 22, 2006
priority date (Note) -
Abandoned
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Abstract
Devices and methods for making fasteners, such as bolts, having one or more components made of single crystal shape memory alloy capable of large recoverable distortions, and in particular having a plateau in the stress-strain relationship. A constant load is applied by a bolt that is tightened until the force exerted by the bolt is equal to the stress multiplied by the cross-section of a tension component in the bolt. Increasing or decreasing the length of the tension component by as much as several percent causes a negligible change in the load.
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